As far as I am aware, this is the first invited session of the American Physical Society devoted to the topic of radiation effects in solids—a field that has been an active one for nearly a decade. I believe it is safe to say that it will not be the last such session. The long delay in this event arises, of course, from the fact that the field received its greatest stimulus from the wartime research in the field of atomic energy so that many aspects of it were classified at the start and will remain classified indefinitely in the future.

1.
See, for example, Lind, Chemical Effects of Alpha Particles and Electrons (Chemical Catalogue Company, 1928).
2.
K.
Przibram
,
Zeits. f. Physik
68
,
403
(
1931
).
3.
M.
Burton
,
J. Phys. Chem.
61
,
611
(
1947
).
4.
A brief account of the theory is given in the paper by the author, Discussions of the Faraday Society, p. 271 (1949).
See also K. Lark‐Horovitz, Semiconducting Materials (Academic Press, Inc., New York), p. 47;
D. S.
Billington
and
S.
Siegel
,
Metals Progress
58
,
848
(
1950
).
5.
S.
Siegel
,
Phys. Rev.
76
,
1823
(
1949
).
6.
See the account of M. M. Mills' theoretical work in the review article by K. Lark‐Horovitz, reference 4.
7.
W. H.
Brattain
and
G. L.
Pearson
,
Phys. Rev.
80
,
846
(
1950
).
8.
J. C.
Slater
,
Jour. App. Phys.
22
,
237
(
1951
).
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